An Optical Illusion is a type of visual illusion where our brain perceives an image that is different from its actual ...

Optical illusions are older than you think. The first optical illusions date back to 20,000 BC and took the form of cave sculptings. Nowadays they are found all over the place – on screens, in books ...

Look closely at this picture. At first glance, you can see a big tortoise in the centre of the image. But look closer, and ...